The bad quoting issue is fixed, it was caused by the move to the new esc_html() function from WordPress.
Here’s the quick fix. In bb-includes/functions.bb-formatting.php go to line 83 and replace:
$text = esc_html( $text );
$text = wp_specialchars( $text, ENT_NOQUOTES );
Thanks for addressing this problem but the “fix” doesn’t change a thing for me unfortunately.